No authorization to start tests (system &2 client &3 user &1)

What causes this issue?

The user does not have the required authorization in the target system
to execute eCATT scripts.
The authorization for executing eCATT test cases is checked.
Alternatively, the authorization to execute CATT scripts is also
sufficient.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Assign the required authorizations to the user in the target system.
Alternatively, select a user who does have the required authorizations
in the RFC destination / HTTP destination.

Procedure for System Administrators

Assign the following authorization to the user:
Authorization Object,,S_DEVELOP
Object Type ,,,,,,OBJTYPE,,,,Value ,,ECSC
Object Name,,,,,,OBJNAME,,,,Value,,*
Activity,,,,,,ACTVT,,,,Value,,16
The following authorization is required for target systems with Release
SAP_BASIS <(><<)> 6.20:
Authorization Object,,S_DEVELOP
Object Type ,,,,,,OBJTYPE,,,,Value ,,SCAT
Object Name,,,,,,OBJNAME,,,,Value,,*
Activity,,,,,,ACTVT,,,,Value,,16

Error message extract from SAP system. Copyright SAP SE.